CASE C4 Deki Andu water supply Eritrea by Manfred Arlt NCA

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CASE C4 Deki Andu water supply Eritreaby Manfred
Arlt NCA
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CASE Water supply Deki Andu Eritrea

• Eritrea is an arid and semi-arid country and is
  not endowed with rich water recourses. Only 54
  of population living in rural areas have access
  to safe water supply http//www.eoearth.org/articl
  e/Water_profile_of_Eritrea). Groundwater is the
  major water source. This case study is related
  to a potable water supply project in a rural
  village in Eriteria, Deki Andu. The inhabitants
  of, have acquired potable water supply as a
  result of the implementation of a project at a
  cost of 2.8 million Nakfa (2.8 mill. Nakfa is
  about 1 mill NOK). The project was supported by
  Norwegian Church Aid (NCA). The subsequent slides
  gives you more information about the project. In
  order to make you familiar with the design and
  planning aspects of rural water supply projects
  some questions have been formulated in the next
  two slides. Use information from these ppt slides
  and the lectures week 42 and 43 as well as the
  STEP UMB website to solve the case.

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Questions

• How big must be the catchment area for assuring
  an adequate water supply for the population at
  the end of the design period of 10 years with a
  population growth rate of 3 per year and a water
  demand of 40 l/p.d? The infiltration to
  groundwater can be assumed to be 5 of the total
  annual rainfall. Future population can be
  calculated using formula
• Future population Pn
• Pn Po (1 r)n
• n years time
• r population growth rate (assume 0.03)
• 3. What are good features for hand-dug well to
  minimize the risk of contamination of the water?
• 4. Why are gender issues important in such
  projects?
• List possible impacts of such a water scheme on
  women, girls, boys and mens daily life and long
  term impacts.
• 5. Outline the design of the water system
• Which capacity should a submersible pump have?
• What is a proper size of the water storage tank?
  
• What dimensions and types of pipes do you
  suggest to use?
• 6. Outline an operation and maintenance (OM)
  plan for the water supply system.
• 7. What are important issues for the
  sustainability of such a water scheme?

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Thank you for your attention
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http//en.wikipedia.org/wiki/Groundwater_recharge
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